ENH: use the method SetDefaultParameter{Int,Float} when setting default values

Applications/Classification/otbKMeansClassification.cxx

Applications/Classification/otbTrainSVMImagesClassifier.cxx

Applications/Hyperspectral/otbHyperspectralUnmixing.cxx

...ns/RadiometricIndices/otbRadiometricVegetationIndices.cxx

Applications/Radiometry/otbOpticalCalibration.cxx

Applications/Segmentation/otbMeanShiftSegmentation.cxx

Applications/Test/otbTestApplication.cxx

Applications/Util/otbExtractROI.cxx

Applications/Util/otbMultiResolutionPyramid.cxx

Applications/Util/otbRescale.cxx

Applications/Util/otbSmoothing.cxx